What is the role of the secret key added to the hash function in Figure 31.17 in
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What is the role of the secret key added to the hash function in Figure 31.17 in the text (MAC)? Explain.
Figure 31.17
Transcribed Image Text:
Figure 31.17 Message authentication code Alice Bob M: Message K: A shared secret key MAC: Message authentication code K K МАС МАС Hash Hash Same?0 [no] M+ MAC Discard M + MAC Insecure channel M+ MAC [yes] Keep the message
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